After a quick scan through this thread, these two particularly caught my eye:
What's happened to Terrapin Station? I guess it's too late to congratulate him on some really good choices here.

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In its day, I thought this one was pretty good, especially the implied anger of the back-cover image:

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And here are two that are perhaps clever rather than great - on the topic of which, does anyone remember an album that has a torn album cover as its album cover?
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P.S: I also like the Joan Baez and PJ Harvey covers from MicShazam, and yours too, blankmind; that's a great image, but it does break one of my cardinal rules:-
an album cover should tell u the name of the artist and album.